vlan: Don't propagate flag changes on down interfaces.
When (de)configuring a vlan interface, the IFF_ALLMULTI ans IFF_PROMISC
flags are cleared or set on the underlying interface. So, if these flags
are changed on a vlan interface that is not up, the flags underlying
interface might be set or cleared twice.
Only propagating flag changes when a device is up makes sure this does
not happen. It also makes sure that an underlying device is not set to
promiscuous or allmulti mode for a vlan device that is down.
Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index c8cf939..bc25286 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -470,10 +470,12 @@
{
struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
- if (change & IFF_ALLMULTI)
- dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
- if (change & IFF_PROMISC)
- dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
+ if (dev->flags & IFF_UP) {
+ if (change & IFF_ALLMULTI)
+ dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+ if (change & IFF_PROMISC)
+ dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
+ }
}
static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)